<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <button>{{item | handleItem}}</button>
    <!-- <button>2</button> //(i+6)/6 -->
    <script>
        var total = 18
        //18 6
        /* 
            offset  0
            offset  6
            offset  12
       */
        var arr = [];
        for(var i = 0;i<18;i+=6){
            arr.push(i)//0,6,12
        }
        console.log(arr)
    </script>
</body>
</html>